Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In the X Window System, an X session manager is a session management program, a program that can save and restore the current state of a set of running applications. From the point of view of an X session manager, a session is a “state of the desktop” at a given time: a set of windows with their current content. More precisely, a session is the set of clients managing these windows or related to them and the information that allows these applications to restore the condition of these windows if required. The most recognizable effect of using a session manager is the possibility of logging out from an interactive session and then finding exactly the same windows in the same state when logging in again.

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